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Bollywood heartthrob Ranbir Kapoor is all praise for his father Rishi Kapoor's performance in Karan Johar's 'Agneepath' and says it is the latter's passion for work that inspires him to do better. Rishi Kapoor has essayed a negative role in the film that released yesterday. The veteran actor has also experimented with his looks in the film with his kohl-eyed character donning a kurta-pajama, and sporting a karakul cap.

"I am hearing such amazing stuff about my father's performance in 'Agneepath'. He is a brilliant actor. If a person is a good actor then the person will continue to work lifelong and keep giving good performances. He is 55 plus but he is still getting so of much of work to do," says Ranbir.

"There is some sort of childishness (in him) when he gets offers for any movie or any new character. His passion for work...for cinema inspires me to do better work," he adds. The father-son duo will be seen together for the first time in a commercial for a soft-drink brand.

On the possibility of them being seen together on the big screen, Ranbir says, "No one has really offered us a script that both of us liked. We both are individual actors and if a good script, good characters come our way and and we both like it then we will definitely work together."

Ranbir, who has already bagged two 'best actor' awards for his performance in Imtiaz Ali's 'Rockstar', is happy that the hard work he put in for the film has paid off. "I have worked hard in 'Rockstar' and I feel I'm lucky to get an opportunity to work with Imtiaz Ali, Shammi Kapoor, AR Rahman and others," he adds.